Abstract: In order to evaluate the wear status of cylinder liner-piston components by using engine cylinder liners’ vibration signal features， this study established a dynamic model of cylinder liner， piston， crank and connecting rod of the engine and carried out its dynamic simulation. Then the vibration analysis of the cylinder liner surfaces was conducted， and the correlation dimension-based signal features of the simulated vibration signals were evaluated. The analytical results showed that when the cylinder-piston wear clearance increases， the vibration signal amplitude increases， the self-correlation degree also increases， and the correlation dimension of the cylinder liner surfaces’ vibration signal decreases. These correlation dimensions can serve as feature indexes to evaluate the wear status of engine cylinder liner-piston components.

Key words: engine, vibration signal, wear clearance, correlation dimension, feature analysis